morin



Feb. 21, 1956 L. H. MORI 2,735,139

METHOD OF SECU c SEPA LE F ENER ELEMENTS STRINGER TAPE Filed Dec. 23, 1952 gig/1 5- $1 4' [O U n 7 INVENTOR LOUIS H MORIN ATTORNEY United States Patent METHOD OF SECURING SEPARABLE FASTENER ELElvmNTS T0 STRINGER TAPES Louis H. Morin, Bronx, N. Y. Application December 23, 1952, Serial No. 327,495

Claims. (Cl. 18-59) The present invention relates to improvements in method of securing separable fastener elements to stringer tape.

An object of the present invention is to provide a method for die-casting the elements or scoops of a separable fastener on a stringer tape in such a way that an integral part of the scoop extends through the tape to anchor the scoop in place on the tape positively. In accordance with the present invention, an opening in the tape is formed within the die cavity and is maintained positively until the material forming the scoop has been forced through such opening. The preventing of such an opening in the tape from closing prior to the passage through it of the material forming the scoop is especially important where the tape is woven from resilient materials such as nylon. Also, the present invention makes it possible to anchor scoops formed of a resilient material such as nylon to a tape without any risk of the scoop being moved or pulled out of place after it has been formed on the tape.

Other novel features of the invention will be best understood from the following description, when taken together with the accompanying drawing, in which certain embodiments of the invention are disclosed and, in which, the separate parts are designated by suitable reference characters in each of the views and, in which:

Fig. 1 is a diagrammatic sectional view through a part of a pair of dies having a scoop cavity on adjacent abutting surfaces thereof and indicating the first step of piercing a stringer tape supported between the dies and within said cavity.

Fig. 2 is a view similar to Fig. 1 indicating the injection of moulding material into the cavity to extend into the opening formed in the tape and prior to the complete formation of the scoop, the piercing needle or element being indicated in another position in dotted lines.

Fig. 3 is a view similar to Fig. 2 showing the completion of the formation of the scoop in the die cavity and Within the opening formed in the tape; and

Fig. 4 is a side view of a small section of tape illustrating a pair of trimmed scoops attached to the beaded edge portion of the tape, according to the method disclosed in Figs. 1 to 3, inclusive.

In illustrating one adaptation of my invention, I have shown in Figs. 1 to 3, inclusive, portions of a pair of dies and 11, within and between adjacent surfaces of which is formed a scoop impression or cavity 12, which may be of any desired contour. At 13 is shown the sprue or gate on the parting line of the dies and opening into the cavity for pressure injection of heated material into the dies in forming a scoop 14 on a stringer tape 15.

In Fig. 4 of the drawing, I have shown a small section on the completed product, in which figure 16 represents the beaded edge of the tape, on which the scoops 14 are attached in accordance with the method more fully hereinafter set forth. It will be apparent that any type and kind of scoop structure can be formed, the scoop structure having a mounting end portion 17 and a suitably formed coupling end portion. The coupling end portion 18 is substantially of the type and kind disclosed in my prior application Ser. No. 307,279, filed August 30, 1952.

Movably supported in the die 10 in any desired manner is a needle or piercing rod or pin 19, the pointed end 29 of which is adapted to extend into an aperture 21 in the die 11, in which a plunger 22 is movably mounted by suitable means. The tape 15 is firmly gripped between the abutting surfaces of the dies, as at 23, 23' at a point spaced with respect to the bead 16 and the dies also engage the ends of the part 24 of the tape, which is arranged within the cavity 12. The surfaces engaging the ends of the part 24 are indicated generally by the reference characters 25, 25'. It will be seen from a consideration of Fig. 1 of the drawing that the bead 16 of the tape is arranged in the cavity 12 at a point beyond the alinement of the pin 19 with the plunger 20 so that, in actuating the pin 19 through the supported part 24 of the tape within the cavity, an opening or passage 26 is formed in the tape adjacent the bead 16. By employing the pointed end 20 on the pin 19, it will be apparent that the opening is formed primarily in the spreading of the strands of the tape, rather than piercing or shearing the strands, as would be the case with a punch. This is advantageous from the standpoint that the structure of the tape is not weakened to any appreciable degree.

Because of the give in the tape it is desirable to provide for an overtravel of the pin 19 and when the pin 19 passes through the tape 15, it projects into the aperture 21 in the die 11 to insure that the pin will pass entirely through the tape. The aperture 21 in the die 11 is normally maintained closed by the movable plunger 22. Thus, after the pin 19 has fashioned the opening in the manner diagrammatically shown in Fig. 1 of the drawing and has been retracted from the position shown in Fig. 1 substantially to a position, such as indicated in dot and dash lines in Fig. 2, the plunger 22 is moved back to bring the inner surface 22' thereof in alinement with the wall 12' of the cavity 12. The heated casting material is pressure injected into the cavity through the sprue or gate passage 13 and while the pressure on the casting material is maintained, the pin 19 is moved from the position shown in Fig. 2 of the drawing toward its final stop position shown in Fig. 3. Due to the pressure being maintained on the casting material, the casting material follows the pin 19 through the opening in the tape as the pin is withdrawn to form an integral part 27 of the scoop extending through the tape. Under such conditions the opening in the tape never has an opportunity to close up and restrict the free flow through of the casting material. After the pin 19 is withdrawn, the cavity is completely filled and the scoop 14 formed with an integral gate 14' which is trimmed off in completing the product, as shown in Fig. 4 of the drawing.

The above described control of the passage of the casting material through the opening 26 in the tape, as indicated in Fig. 2 of the drawing, is important, particularly with certain types and kinds of tapes, where the strands of material from which the tape is formed have what might be termed resilient characteristics. For example, with tapes woven from nylon, the passage of a pin element, such as the element 19 through the tape and then withdrawal thereof, would result in a substantial closure of the opening; whereas, with the method disclosed, the pin serves to support and maintain the strands in a position permitting the entrance of the material into the opening, as is clearly illustrated in Fig. 2 of the drawing.

It will appear from a consideration of Fig. 3 of the drawing that the pin 19 is stopped at a position maintaining the large diameter of the pin at or in alinement with the wall 12" of the cavity 12, as indicated at 28 in said figure. This will result in the formation of a slight conical recess or depression 29 at one side of the scoop, as also shown in Fig. 4 of the drawing.

It will be understood that, in the operation of the apparatus disclosed, the pin 19, as well as the plunger 22 are actuated in timed relation with respect to the cycle of pressure injection of the heated metal or plastic material into the cavity of the dies. It will also be apparent that, after the product has been formed in the manner shown in Fig. 3, the dies are separated, a new section of tape is then moved into position between the dies, the dies again closed in the manner shown in Fig. 1; whereupon, the pin and plunger 19 and 20, respectively, are actuated in the manner shown in said figure and the above cycle of operation is repeated. v

' While in the foregoing description, I have described the method from a standpoint of a single impression, it will also be apparent that the dies may include a series of cavities or impressions and the corresponding series of the pins 19 and plungers 22 in forming simultaneously on the edge of a stringer tape is predetermined number of scoops in accordance with practices known in the art.

It will be understood that any type of mounting may be supported within and between a pair of dies to expose a part of the mounting in the die cavity and then a member, suchas the pointed rod or needle is passed through that part of the mounting arranged within the cavity to spread the strands of the mounting in forming an opening, which is later filled by the moulded material, which is pressure injected into the die cavity. In some instances and with some materials, the openings may be formed in different ways, but the primary purpose is to establish anchorage of the moulded product through the material of the mounting to prevent displacement of the product therefrom.

Having fully described my invention, what I claim as new and desire to secure by Letters Patent is:

l. The herein described method of securing scoops of separable fastener stringers against displacement on a mounting tape, which includes the steps of supporting an edge portion of a tape within a cavity formed by a pair of (lies, then forming an opening in that portion of the tape disposed within the die cavity by moving a pin through the die cavity and through that part of the tape disposed within the die cavity, then injecting casting material under pressure into the die cavity while maintaining said opening in the tape and then withdrawing the pin from the opening in the tape and simultaneously forcing the casting material through said opening under pressure as the pin is withdrawn.

2. The herein described method of securing scoops of separable fastener stringers against displacement on a mounting tape of woven material, which includes the steps of placing an edge portion of a tape of woven material within a cavity formed by a pair of dies, supporting the tape in the cavity by the dies, then separating strands of the woven material to form an opening in the portion of the tape disposed within the die cavity by moving a pin through the die cavity and through that part of the tape disposed within the die cavity, then injecting casting material under pressure into the die cavity while maintaining said opening in the tape and then retracting said pin through the opening in the tape and simultaneously fording the casting material through said opening under presseparable fastener stringers against displacement on amounting tape, which includes the steps of supporting an edge portion of a tape between a pair of relatively movable dies with a portion of the tape being positioned with a cavity formed by the dies, then moving a pointed pin through the die cavity and through that part or the tape disposed in the die cavity to form an opening in the tape, then retracting said pin partially through said opening and injecting heated material into the cavity under pressure to form a scoop on that part of the tape disposed within the die cavity and then retracting the pin entirely through said opening in the tape and forcing the heated material through said opening under pressure as the pin is retracted.

4. The herein described method of forming and anchoring scoops on the edge portion of a stringer tape,

which consists in providing a pair of dies having amovable plunger in one die and a pointed pin movably supported in the other die, said pin being axially alined with said plunger arranging an edge portion of a stringer tape within and between the dies to expose a part thereof in the die cavity and in the path of movement of said pointed pin, firmly supporting the tape in the cavity by said dies, then moving said pin across the die cavity through that part of the tape supported therein to form an opening in the tape while retracting said plunger to allowthe pointed end of the pin to extend beyond the limits of the cavity, then retracting said pin and moving the plunger to bring the inner end thereof in alinement with the cavity wall of the die, then injecting heated material into the die cavity under pressure while the pin to support the tape extends through the opening formed thereby in the tape and then retracting the pin through said opening in the tape and forcing the heated material through said opening under pressure as the pin is retracted.

5. The method of anchoring an injection moulded product to a fabric mounting, which comprises supporting apart of the mounting by and between a pair of dies to expose said part within a cavity formed by the dies, then passing a member through that part of the mounting'exposed in said cavity to spread strands of the mounting to form an opening therein, and then injecting heated material into the die cavity under pressure while said member extends through the mounting and then withdrawing said member from the opening in the mounting and forcing the heated material through said opening as the member is withdrawn,

References Cited in the file of this patent UNITED STATES PATENTS 729,825 Whittemore June 2, 1963 2,041,843 Marinsky May 26, 1936 2,083,279 Quisling June 8, 1937 2,264,580 Morin Dec. 2, 1941 2,375,996 Kaufman er a1 May 15, 1945 

